Want to start with A Dream of Red Mansions, which version is the most reliable?

Personally, I recommend Yuelu Bookstore Edition. Yuelu Bookstore's 87th edition of A Dream of Red Mansions uses the biographical edition and the Cheng Yi edition. Now the latest edition has added other versions of Stone for proofreading.

People's Literature Publishing House is also good, but you'd better buy the new school-based one published in March by 1982. The first 80 editions were changed to the Chen Geng edition, and the last 40 editions were still the log edition.